This is a class to create DataFrames from ROOT to R

TRDataFrame class

DataFrame is a very important datatype in R and in ROOTR we have a class to manipulate
dataframes called TRDataFrame, with a lot of very useful operators overloaded to work with TRDataFrame's objects
in a similar way that in the R environment but from c++ in ROOT.
Example:

Lets to create need data to play with dataframe features

Creating variables

TVectorD v1(3);
std::vector<Double_t> v2(3);
std::array<Int_t,3>  v3{ {1,2,3} };
std::list<std::string> names;

Assigning values

v1[0]=1;
v1[1]=2;
v1[2]=3;
v2[0]=0.101;
v2[1]=0.202;
v2[2]=0.303;
names.push_back("v1");
names.push_back("v2");
names.push_back("v3");
ROOT::R::TRInterface &r=ROOT::R::TRInterface::Instance();

In R the dataframe have associate to every column a label, in ROOTR you can have the same label using the class ROOT::R::Label to create a TRDataFrame where you data have a label associate.

Creating dataframe object with its labels

using namespace ROOT::R;

TRDataFrame df1(Label["var1"]=v1,Label["var2"]=v2,Label["var3"]=v3,Label["strings"]=names);

Passing dataframe to R's environment

r["df1"]<<df1;

r<<"print(df1)";

Output

var1  var2 var3 strings
  1 0.101    1      v1
  2 0.202    2      v2
  3 0.303    3      v3

Manipulating data between dataframes

Adding colunms to dataframe

TVectorD v4(3);
//filling the vector fro R's environment
r["c(-1,-2,-3)"]>>v4;
//adding new colunm to df1 with name var4
df1["var4"]=v4;
//updating df1 in R's environment
r["df1"]<<df1;
//printing df1
r<<"print(df1)";

Output var1 var2 var3 strings var4 1 1 0.101 1 v1 -1 2 2 0.202 2 v2 -2 3 3 0.303 3 v3 -3

Getting dataframe from R's environment

ROOT::R::TRDataFrame df2;
r<<"df2<-data.frame(v1=c(0.1,0.2,0.3),v2=c(3,2,1))";
r["df2"]>>df2;
TVectorD v(3);
df2["v1"]>>v;
v.Print();
df2["v2"]>>v;
v.Print();

Output

Vector (3)  is as follows
     |        1  |
------------------
   0 |0.1
   1 |0.2
   2 |0.3
Vector (3)  is as follows
     |        1  |
------------------
   0 |3
   1 |2
   2 |1

Working with colunms between dataframes

df2["v3"]<<df1["strings"];
//updating df2 in R's environment
r["df2"]<<df2;
r<<"print(df2)";

Output

v1 v2 v3
0.1  3 v1
0.2  2 v2
0.3  1 v3

Working with colunms between dataframes

//passing values from colunm v3 of df2 to var1 of df1
df2["v3"]>>df1["var1"];
//updating df1 in R's environment
r["df1"]<<df1;
r<<"print(df1)";

Output

var1  var2 var3 strings var4
 v1 0.101    1      v1   -1
 v2 0.202    2      v2   -2
 v3 0.303    3      v3   -3

Users Guide

http://oproject.org/tiki-index.php?page=ROOT+R+Users+Guide
https://root.cern.ch/drupal/content/how-use-r-root-root-r-interface

Definition at line 183 of file TRDataFrame.h.

Classes
class	Binding

Public Member Functions
	TRDataFrame ()
	Default TDataFrame constructor. More...

	TRDataFrame (SEXP obj)
	TDataFrame constructor. More...

	TRDataFrame (const TRDataFrame &_df)
	TDataFrame copy constructor. More...

	TRDataFrame (const Rcpp::DataFrame &_df)
	TDataFrame constructor for Rcpp::DataFrame. More...

Binding	operator[] (const TString &name)

TRDataFrame &	operator= (TRDataFrame &obj)

TRDataFrame &	operator= (TRDataFrame obj)

TRDataFrame &	operator= (SEXP obj)

	operator SEXP ()

	operator SEXP () const

int	GetNcols ()
	Method to get the number of colunms. More...

int	GetNrows ()
	Method to get the number of rows. More...

TVectorString	GetColNames ()
	Method to get labels of dataframe. More...

template<class T >
TMatrixT< T >	AsMatrix ()
	Method to get dataframe as matrix. More...

void	Print (TString label="")
	Method to print the dataframe in stdout or a column given the label. More...

Public Member Functions inherited from TObject
	TObject ()

	TObject (const TObject &object)
	TObject copy ctor. More...

TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...

virtual	~TObject ()
	TObject destructor. More...

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action. More...

virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...

virtual void	Clear (Option_t *="")

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method. More...

virtual void	Copy (TObject &object) const
	Copy this to obj. More...

virtual void	Delete (Option_t *option="")
	Delete this object. More...

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object. More...

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects. More...

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

virtual void	Dump () const
	Dump contents of object on stdout. More...

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py). More...

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes. More...

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes. More...

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...

virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...

virtual const char *	GetName () const
	Returns name of object. More...

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual Option_t *	GetOption () const

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...

virtual const char *	GetTitle () const
	Returns title of object. More...

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...

virtual ULong_t	Hash () const
	Return hash value for this object. More...

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...

virtual Bool_t	IsSortable () const

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. More...

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself. More...

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself. More...

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list. More...

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out". More...

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory. More...

void *	operator new (size_t sz)

void *	operator new[] (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz, void *vp)

void	operator delete (void *ptr)
	Operator delete. More...

void	operator delete[] (void *ptr)
	Operator delete []. More...

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...

void	SetBit (UInt_t f)

void	ResetBit (UInt_t f)

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

void	InvertBit (UInt_t f)

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message. More...

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message. More...

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message. More...

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message. More...

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message. More...

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...

Protected Attributes
Rcpp::DataFrame	df

Friends
class	TRInterface

SEXP	Rcpp::wrap (const TRDataFrame &f)

Additional Inherited Members
Public Types inherited from TObject
enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...

static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

Protected Member Functions inherited from TObject
void	MakeZombie ()

virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

#include <TRDataFrame.h>

Inheritance diagram for ROOT::R::TRDataFrame:

[legend]

Constructor & Destructor Documentation

ROOT::R::TRDataFrame::TRDataFrame ( )

Default TDataFrame constructor.

ROOT::R::TRDataFrame::TRDataFrame ( SEXP obj )

inline

TDataFrame constructor.

Parameters

obj	raw R object that can be casted to DataFrame

Definition at line 350 of file TRDataFrame.h.

TRDataFrame::TRDataFrame ( const TRDataFrame & _df )

TDataFrame copy constructor.

Parameters

_df	other TRDataFrame

Definition at line 22 of file TRDataFrame.cxx.

ROOT::R::TRDataFrame::TRDataFrame ( const Rcpp::DataFrame & _df )

inline

TDataFrame constructor for Rcpp::DataFrame.

Parameters

_df	raw dataframe from Rcpp

Definition at line 363 of file TRDataFrame.h.

Member Function Documentation

template<class T >

TMatrixT<T> ROOT::R::TRDataFrame::AsMatrix ( )

inline

Method to get dataframe as matrix.

Note: only work on numerical dataframes if some column if string or other it will fail

Returns: TMatrixT with a given tamplate data type

Definition at line 430 of file TRDataFrame.h.

TVectorString ROOT::R::TRDataFrame::GetColNames ( )

inline

Method to get labels of dataframe.

Returns: colunms names

Definition at line 417 of file TRDataFrame.h.

int ROOT::R::TRDataFrame::GetNcols ( )

inline

Method to get the number of colunms.

Returns: number of cols

Definition at line 401 of file TRDataFrame.h.

Referenced by GetColNames(), and TMVA::MethodRSVM::MethodRSVM().

int ROOT::R::TRDataFrame::GetNrows ( )

inline

Method to get the number of rows.

Returns: number of rows

Definition at line 409 of file TRDataFrame.h.

ROOT::R::TRDataFrame::operator SEXP ( )

inline

Definition at line 387 of file TRDataFrame.h.

ROOT::R::TRDataFrame::operator SEXP ( ) const

inline

Definition at line 392 of file TRDataFrame.h.

TRDataFrame& ROOT::R::TRDataFrame::operator= ( TRDataFrame & obj )

inline

Definition at line 369 of file TRDataFrame.h.

TRDataFrame& ROOT::R::TRDataFrame::operator= ( TRDataFrame obj )

inline

Definition at line 375 of file TRDataFrame.h.

TRDataFrame& ROOT::R::TRDataFrame::operator= ( SEXP obj )

inline

Definition at line 381 of file TRDataFrame.h.

TRDataFrame::Binding TRDataFrame::operator[] ( const TString & name )

Definition at line 28 of file TRDataFrame.cxx.

void ROOT::R::TRDataFrame::Print ( TString label = "" )

inline

Method to print the dataframe in stdout or a column given the label.

Parameters

label nomber of the column to print

Definition at line 440 of file TRDataFrame.h.

Referenced by DataFrame().

Friends And Related Function Documentation

SEXP Rcpp::wrap ( const TRDataFrame & f )

friend

friend class TRInterface

friend

Definition at line 184 of file TRDataFrame.h.

Member Data Documentation

Rcpp::DataFrame ROOT::R::TRDataFrame::df

protected

Definition at line 187 of file TRDataFrame.h.

Referenced by AsMatrix(), ROOT::R::TRInterface::Assign(), GetColNames(), GetNcols(), GetNrows(), operator SEXP(), operator=(), operator[](), Print(), TRDataFrame(), and Rcpp::wrap().

Collaboration diagram for ROOT::R::TRDataFrame:

[legend]

The documentation for this class was generated from the following files:

bindings/r/inc/TRDataFrame.h
bindings/r/src/TRDataFrame.cxx

TRDataFrame class

Creating variables

Assigning values

Creating dataframe object with its labels

Passing dataframe to R's environment

Adding colunms to dataframe

Getting dataframe from R's environment

Working with colunms between dataframes

Users Guide

Classes

Public Member Functions

Protected Attributes

Friends

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation